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    摄影常用的几种曝光方法
    2016/5/3 11:23:54
    今天我们济南高考摄影培训机构小编给大家介绍的是常用的几种曝光方法:
    Today we Ji'nan college entrance examination photography training institutions to introduce a small series of several exposure methods are commonly used:
    1、平均曝光法
    average exposure method
    平均曝光法是依据被摄对象的平均亮度作不曝光依据的一种曝光方法,常用于风光摄影和团体摄影。在一些自动控制曝光的相机上,多采用全面平均测光,按测得的亮度的平均值控制曝光。
    Average exposure method is based on the average brightness of the object is used as a basis for the exposure of the exposure method, commonly used in light photography and group photography. In some of the automatic exposure of the camera, the use of a comprehensive average of light, according to the measured brightness of the average control exposure.
    被摄物平均亮度的精确计算是十分复杂的问题,在实践中,一般先观察被摄物最亮、最暗和中间亮部分的亮暗所占的比例,按中间亮度曝光,也可使用测光表来测定平均亮度并确定相应的曝光组合。
    Be taken for accurate calculation of the average brightness is a very complicated problem, in practice, generally the first observation was taken from the bright and the dark and bright part of bright and dark accounted for the proportion of, exposing according to brightness middle, use meter to measure the average luminance and determine the corresponding exposure group.
    应当指出,采用平均曝光,不是指绝对平均。一是景物精确的平均亮度是很难计算出来的,也没有这样的必要;二是要求画面上反映的景物要有主有次,在考虑夹克平均曝光时,应考虑主体物能否在照片上得到较好的显示,然后才能确定用什么亮度值曝光为好,三是考虑照片反差的需要,在黑白照片中,可以通过曝光量和显影互调的方法来控制把关,四是当被摄景物包括天空时,不能把天空的亮度与景物的亮度一起来平均,否则夹克平均亮度会过大,因而会造成曝光不足。
    It should be noted that the average exposure, not the absolute average. Intermodulation photos in the landscape to be accurate average brightness is very difficult to calculate out of, there is no such necessary; the second is to ask the picture reflects the scenery to the main, in consideration of the jacket average exposure, consideration should be given to the subject matter can get a better display, and then can be determined by what the brightness value of exposure as well, three is to consider the picture contrast, in black and white photographs, the exposure and developing methods to control checks, the fourth is the photo scenery including the sky, the sky brightness and the scene brightness with average or jacket average brightness is too large, which will result in underexposure.
    2、极限曝光法
    limit exposure method
    极限曝光指按感光片的宽容度所允许的最低曝光量或最高曝光量曝光。实际上是取曝光量的极限,因此称为极限曝光。采用极限曝光只有亮度最强或最低部分的景物才能在感光片上暗淡无光显示出来,这对于最大限度地突出被摄物相当规模某个细节、特征有重要作用。但是,只有损失照片其他部分的层次可以接受时,才能采用。
    According to the minimum limit exposure refers to the exposure of the photosensitive sheet allowed tolerance or maximum exposure exposure. Actually take exposure limit, so called exposure limit. By limiting exposure only the strongest brightness or the lowest part of the scenery to photographic plates in the bleak displayed the maximum outstanding be taken quite scale a details and characteristics have an important role. However, only the other part of the loss level photos can be accepted, can be used.
    3、重点曝光法
    key exposure method
    重点曝光法是否按被摄主体的亮度作为曝光依据的一种曝光方法。
    Key exposure method is according to the brightness of the subject as a basis for the exposure exposure method.
    按此法曝光,主体在画面上能得到最好的显示,其他景物的显示则较差,但这不影响照片的质量,重点曝光法是常用的曝光方法之一。重点曝光法主要适用于景物亮度反差大于感光片宽容度以及景物反差虽不大,但为了突出主体,显示主体物的形态和特征的情况。
    According to the method of exposure, the subject can get the best display on the screen, the other scenery showed poor quality, but this does not affect the photo exposure, key method is one of the commonly used method of exposure. Key exposure method is mainly applicable to the scene brightness contrast than photographic film tolerance and scene contrast is not large, but in order to highlight the main characteristics of the subject matter of the case.